Free Online Developer Tools

Format, encode, generate, and convert data with our suite of developer tools. All processing happens in your browser.

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JSON Formatter

Format, validate, and minify JSON data with syntax highlighting.

Format JSON
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Base64 Converter

Encode and decode Base64 strings. Support for text and files.

Convert Base64
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URL Encoder/Decoder

Encode and decode URL components and query strings.

Encode URL
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HTML Formatter

Beautify and minify HTML code with proper indentation.

Format HTML
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UUID Generator

Generate unique UUIDs (v4) for your applications.

Generate UUID
#️⃣

Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes.

Generate Hash
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QR Code Generator

Create QR codes for URLs, text, WiFi, and more.

Generate QR
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Password Generator

Generate strong, secure passwords with custom rules.

Generate Password
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CSV Editor

Import, edit, add rows/columns and export CSV files inline.

Edit CSV
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Data Converter

Convert between CSV, JSON, and TSV formats instantly.

Convert Data
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JSON Table Viewer

Paste a JSON array and view it as a sortable, filterable table.

View Table
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Markdown Editor

Write Markdown with a live HTML preview. Export to HTML or .md.

Edit Markdown
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Meta Tag Generator

Generate SEO meta tags, Open Graph and Twitter Card markup.

Generate Tags
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Open Graph Preview

Preview how your link will look when shared on social media.

Preview OG
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Browser Storage Viewer

Inspect and manage localStorage & sessionStorage data.

View Storage
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File Checksum

Calculate SHA-256, SHA-512 and SHA-1 hashes for any file.

Calculate Hash
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Secure Notes

Encrypt and decrypt text with a passphrase using AES-256-GCM.

Encrypt Text
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Device Inspector

View your browser capabilities, screen, GPU and network info.

Inspect Device
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What's My IP

Find your public IP address, location, ISP and connection details.

Check IP

Why Use Our Developer Tools?

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Secure Processing

All data processing happens in your browser. Nothing is sent to external servers.

⚡

Instant Results

No waiting for server responses. Everything processes instantly on your device.

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Free Forever

All tools are completely free with no limits, no registration, and no restrictions.

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Works Anywhere

Use on any device with a modern web browser. No installation needed.

How These Developer Tools Work

Our developer tools are built to be predictable, transparent, and fast. You can paste input, tweak settings, and instantly see results without waiting for server-side processing.

  • Client-side processing: Formatting, encoding, hashing, and conversions happen in your browser.
  • Clear outputs: Results are displayed with copy/export options for quick reuse.
  • Safe by design: Sensitive text and files stay on your device whenever possible.

Common Use Cases

  • API debugging: Format JSON responses and quickly inspect payloads.
  • Secure sharing: Generate hashes and checksums to verify file integrity.
  • Productivity: Encode URLs, create UUIDs, and convert data formats in seconds.
  • Content workflows: Generate meta tags, preview Open Graph data, and edit Markdown.

Frequently Asked Questions

No. Most tools run fully in the browser and do not transmit your input to our servers.

Yes. For tools like formatters and encoders, the same input produces the same output. Generators (like UUIDs) are intentionally random.

Yes. You can use the tools for personal and professional tasks. Please review our Terms of Service for details.